退耕植茶地土壤团聚体中有机磷组分分布特征

发布时间：2018-07-12 13:01

本文选题：退耕植茶 + 土壤团聚体　；参考：《山地学报》2017年04期

【摘要】：有机磷是土壤磷库的重要组成部分,其活性大小与土壤供磷能力密切相关。采用野外调查与室内分析相结合的方法,以四川雅安市名山区中峰乡退耕植茶地(2-3年、9-10年、16-17年)为研究对象,选取邻近撂荒地为对照,探讨了退耕植茶地土壤团聚体中有机磷组分的分布特征,结果表明:随着退耕植茶年限的延长,0.25 mm粒径团聚体活性有机磷含量增加;退耕植茶16-17年各粒径中等稳性有机磷显著低于其它退耕年限,中等活性有机磷含量在退耕植茶9-10年最高,含量在99.20-313.29 mg/kg之间。与撂荒地相比,退耕植茶9-10年后土壤团聚体中等活性有机磷含量显著增加;而退耕植茶16-17年土壤团聚体中等稳性有机磷含量显著降低。活性有机磷、中等活性有机磷主要分布于小粒径团聚体中;高稳性有机磷主要分布于5 mm和5-2 mm粒径团聚体;中等稳性有机磷在退耕植茶地中主要分布于5-2 mm、0.5-0.25 mm和0.25 mm粒径团聚体,而在撂荒地中分布较为均匀。对各有机磷组分贡献率最大均为5 mm粒径团聚体,占33.49%-74.96%。随着退耕植茶年限的延长,5 mm粒径团聚体贡献率逐渐增加。不同粒径团聚体对有机磷组分的保持能力具有明显差异,退耕植茶后土壤团聚体中等活性有机磷含量增加,且逐渐呈现活性较低的有机磷形态向活性较高的磷形态转化趋势。
[Abstract]:Organic phosphorus is an important part of soil phosphorus pool, and its activity is closely related to the ability of soil phosphorus supply. Field investigation and indoor analysis were used to study the tea field in Zhongfeng Township of Ya'an City, Sichuan Province, and the adjacent abandoned land was chosen as the control, while the tea field in Zhongfeng Town (2-3 years, 9-10 years, 16-17 years) was used as the research object. The distribution characteristics of organophosphate components in soil aggregates in tea field were studied. The results showed that the active organophosphorus content of soil aggregates increased with the extension of tea returning age. In 16-17 years, the average stable organophosphorus content was significantly lower than that in other years, and the content of moderately active organic phosphorus was the highest in 9-10 years (99.20-313.29 mg/kg). Compared with abandoned land, the content of moderately active organophosphorus in soil aggregates increased significantly after 9-10 years, while the content of moderately stable organic phosphorus in soil aggregates decreased significantly in 16-17 years. Active organophosphorus, medium active organophosphorus mainly distributed in small particle size aggregate, high stable organic phosphorus mainly distributed in 5 mm and 5 ~ 2 mm diameter aggregate, and high stable organic phosphorus mainly distributed in 5 mm and 5 ~ 2 mm diameter aggregate. Medium stable organophosphorus was mainly distributed in 0.5-0.25 mm and 0.25 mm aggregates of 5-2 mm and 0.25 mm in tea field, but it was more evenly distributed in abandoned land. The maximum contribution rate to each organic phosphorus component was 5 mm agglomerates, accounting for 33.49-74.96%. The contribution rate of agglomerates with 5 mm diameter increased gradually with the extension of the years of tea cultivation. There were significant differences in the retention ability of different aggregates to organophosphorus components. After returning to cultivated tea, the content of moderately active organophosphorus in soil aggregate increased, and the low active organophosphorus form gradually changed to the higher active organic phosphorus form.
【作者单位】：四川农业大学资源学院;
【基金】：国家自然科学基金项目(40901138) 四川省科技支撑项目(2013N20044)~~
【分类号】：S153.6

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